Research into Phase Shift Keyed Signals Detection and Recognition Method Based on Time-frequency Analysis
Zhijuan Zheng · Shipboard Electronic Countermeasure · 2011
The detection and recognition to phase shift keyed(PSK) signals under the condition of low signal-to-noise ratio(SNR)(0 dB) are the emphasis and difficulty in present intra-pulse signature analysis.On the basis of this reason,this paper proposes a method based on time-frequency analysis(short time Fourier transform) to detect the signal pulse,then discusses emphatically the modulation type recognition and parameter estimation under low SNR(0 dB),according to the analysis of signal time-frequency signature,sets up the algorithm model detecting and recognizing signals,and present the theory basis of algorithm,the validity of the method is proved through computer simulation experiment.